* io.c (rb_io_readlines, rb_io_each_line): limit must not be zero.

  a patch from Tomoyuki Chikanaga at [ruby-dev:42538].  #4024

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29694 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/io.c b/io.c
index 4b8d34ab29..8fa6613a40 100644
--- a/io.c
+++ b/io.c
@@ -2724,6 +2724,8 @@ rb_io_readlines(int argc, VALUE *argv, VALUE io)
     long limit;
 
     prepare_getline_args(argc, argv, &rs, &limit, io);
+    if (limit == 0)
+	rb_raise(rb_eArgError, "invalid limit: 0 for readlines");
     ary = rb_ary_new();
     while (!NIL_P(line = rb_io_getline_1(rs, limit, io))) {
 	rb_ary_push(ary, line);
@@ -2773,6 +2775,8 @@ rb_io_each_line(int argc, VALUE *argv, VALUE io)
 
     RETURN_ENUMERATOR(io, argc, argv);
     prepare_getline_args(argc, argv, &rs, &limit, io);
+    if (limit == 0)
+	rb_raise(rb_eArgError, "invalid limit: 0 for each_line");
     while (!NIL_P(str = rb_io_getline_1(rs, limit, io))) {
 	rb_yield(str);
     }